Bicycle trainer

ABSTRACT

The present invention is a bicycle trainer that allows a person to utilize their own bicycle and simulates real and varied road conditions. The device includes the front forks of a bicycle mounted to a stand; the stand including a flexible support arm allowing the bicycle to rock back and forth along a rocking arc; and the rear tire of the bicycle making contact with a roller face of a roller such that the roller is free to rotate in proportion to the rotation of the rear tire. Further, the roller is rotationally connected to a motor for selectively applying resistance and assistance to the rear tire rotation, for simulating real course conditions. Preferably it further includes a motor assembly which includes a frame for housing the roller and motor and rigidly connecting the motor assembly to the stand, the motor is pivotally mounted to the frame about its shaft, such that the motor and roller rotate in proportional unison with each other.

This application claims priority from regularly filed U.S. provisional application No. 61/872,942 filed Sep. 3, 2013 by Gary Bauer, Konstantine Poukhov, Nikolay Bakunin under the title BICYCLE TRAINER.

FIELD OF THE INVENTION

The present concept relates to bicycle trainers and more particularly relates to a bicycle trainer that can simulate actual road conditions and utilize the riders own bicycle for the training exercise.

BACKGROUND OF THE INVENTION

There are numerous bicycle trainers which are known in the prior art some of which have been patented including U.S. Pat. No. 7,862,476 titled: Exercise Device, by David A. Blau et al. which was issued on Jan. 4, 2011.

The exercise device described in U.S. Pat. No. 7,862,476 does not enable the person to utilize his or her own bicycle nor does it simulate real road conditions, in particular it does not simulate the freedom of movement available on a regular bicycle in real life conditions.

Most of the bicycle training devices utilize a rigid stand and/or setup such as that described in U.S. Pat. No. 7,862,476 in which the user will sit in a simulated environment and pedal a bicycle like machine which attempts to simulate real road conditions.

There is a need for a bicycle training device which allows a user to utilize his own bicycle which the rider has become comfortable with and allow the freedom of movement that a real bicycle allows when pedalling on a normal road surface.

BRIEF DESCRIPTION OF THE DRAWINGS

The concept will now be described by way of example only with reference to the following drawings in which:

FIG. 1 is a schematic perspective view of a bicycle trainer which includes a bicycle mounted onto a stand and a motor assembly.

FIG. 2 is a schematic partial elevational view of the motor assembly showing part of the rear tire and rear wheel of the bicycle, and the motor assembly.

FIG. 3 is a flow diagram showing in schematic fashion the method of control of the motor.

SUMMARY

The present concept a bicycle trainer comprising:

-   -   a) the front forks of a bicycle mounted to a stand;     -   b) the stand including a flexible support arm allowing the         bicycle to rock back and forth along a rocking arc;     -   c) the rear tire of the bicycle making contact with a roller         face of a roller such that the roller is free to rotate in         proportion to the rotation of rear tire;     -   d) wherein the roller is rotationally connected to a motor for         selectively applying resistance and assistance to the rear tire         rotation, for simulating real course conditions.

Preferably further comprising a motor assembly which includes a frame for housing the roller and motor and rigidly connecting the motor assembly to the stand, the motor is pivotally mounted to the frame about its shaft, such that the motor and roller rotate in proportional unison with each other.

Preferably wherein the motor assembly further including a force sensor for measuring the tangential force between the roller and the bicycle.

Preferably wherein the motor is rigidly mounted to a base plate which has a top side and bottom side which is free to pivot with the motor.

Preferably wherein the motor assembly includes the force sensor in contact with one side of the plate, and a spring on the other side of the plate such that the force sensor and spring restrict the rotational deflection of the base plate and thereby measure the tangential force between the roller.

Preferably where the force sensor and spring are opposing each other mounted on opposite sides of the plate, in order to maintain positive bias of force on the force sensor.

Preferably wherein the force sensor is chosen from the group comprising piezo electric, and strain gauge and load cell and magneto elastic transducers.

Preferably further including a controller which includes data sets for simulating real and imaginary road conditions.

Preferably wherein the motor assembly in response to the controllers input imparts resistance to tire rotation thereby simulating uphill or head wind conditions.

Preferably wherein the motor assembly in response to the controllers input imparts assistance to tire rotation thereby simulating downhill or downwind conditions.

Preferably wherein the flexible support arm selected to allow a rocking arc of 45° each side of centre for a total arc of 90°.

Preferably wherein the flexible support arm selected to allow a rocking arc of 30° each side of centre for a total arc of 60°.

BRIEF DESCRIPTION OF THE DRAWINGS

The concept will now be described by way of example only with reference to the following drawings in which:

FIG. 1 is a schematic perspective view of a bicycle trainer which includes a bicycle mounted onto a stand and a motor assembly.

FIG. 2 is a schematic partial elevational view of the motor assembly showing part of the rear tire and rear wheel of the bicycle, and the motor assembly.

FIG. 3 is a flow diagram showing in schematic fashion the method of control of the motor.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present concept a bicycle trainer shown generally as 100 in FIG. 1 includes the following major components namely bicycle 102, a stand 104, and a motor assembly 106.

Bicycle 102 includes all of the normal components of a bicycle except for the front wheel which has been removed from the front fork 108.

Bicycle 102 therefore will include all of the normal components found in a bicycle including handle bars 110 attached to a bicycle frame 112, including a seat 114, pedals 116, a set of front sprockets 118, a rear wheel 120 having mounted thereon a rear tire 122, a chain 124, engaging with a set of rear sprockets 126.

Bicycle 102 will also include the normal front and rear gear changing device which normally is a front de-railer for selecting a front sprocket 118 and a rear gear selector for selecting one of the rear sprockets 126 thereby allowing the rider of the bicycle to choose the gear ratio.

Stand 104 includes a fork support 130 onto which front fork 108 of bicycle 102 is mounted using fork nuts 133. Fork support 130 is connected to a flexible support arm 132 which in turn is attached to connecting arm 134 and outriggers 136.

Connecting arm 134 is connected at 1^(st) end 140 to outriggers 136 and flexible support arm 132 and at a 2^(nd) end 142 to motor assembly 106.

Motor assembly 106 includes a frame 150 which houses a roller 152 which is connected with a common shaft 154 to a motor 156.

Referring now to FIG. 2 which is a schematic side elevational view of the motor assembly 106 showing frame 150 connected to connecting arm 134 at a 2^(nd) end 142.

The shaft 154 of motor 156 is mounted via bearings onto frame 150 using motor support 162.

Therefore motor 156 is free to rotate about shaft 154 except for the fact that the motor base plate is sandwiched between a force sensor 170 on the upper side 172 of motor base plate 164 and by spring 176 on the lower side 178 of motor base plate 164.

In other words the force sensor 170 and the spring 176 are the only elements which prevent or restrict motor 156 from rotating about shaft 154 when torque is being applied to the motor. Sensor 170 is mounted onto sensor flange 171 which in turn is mounted into frame 150.

The direction of bicycle forward or normal roller rotation is shown as 180 and the upward deflection direction of motor base plate 164 is shown as 182 and the downward deflection direction of motor base plate 164 is shown as 184.

Spring 176 is normally biased against motor base plate 164 therefore force sensor 170 normally sees a positive force even when motor 156 is stationary.

As torque is applied to motor 156 the reaction force of this torque will be measured by force sensor 170 thereby being able to measure instantaneously at any point in time the force being generated by motor 156 against force sensor 170.

Rear tire 122 makes contact with roller face 151 thereby imparting rotational forces onto roller 152 which is attached to the common shaft 154 shared with motor 156. Therefore as roller 152 rotates so does the rotor within motor 156.

Motor base plate 164 is sandwiched between the force sensor 170 and the spring 176. Together force sensor 170 and spring 176 prevent the motor 156 from rotating about axis of rotation 190. The pressure on force sensor 173 allows measuring of tangential force between the roller 150 and the bicycle tire 122.

Spring 176 provides the necessary positive force bias and allows the use of a single force sensor to measure tangential force on the roller 152 in both directions without resulting in a negative force on force sensor 170. The force sensor may be a piezo electric, strain gauge, load cell, magneto elastic device or other commonly known force sensors or transducers.

Referring now to FIG. 3 a signal from the force sensor 170 shown as 202 is fed to a computer 204 which then receives and processes inputs from force censor 170 and from user inputs 206 to set the current motor speed via motor control signal 208 to create a motor speed adjustment 210. Taking into account force value from the force sensor 170, current motor speed 156 and input parameters such as current road grade, combined weight of cyclist and the bike and wind speed the system can then calculate instant changes to motor speed 156 according to physical model of cycling in order to simulate instant forces during pedaling as would be experienced by cyclist if he rode in real life under the same input conditions. One can impart resistive or assisting forces to rear tire 122. For example a road or track course which includes an uphill or headwind portion results in the motor imparting resistance forces which simulate the uphill gradient. In a downhill or tailwind portion of the course the motor will impart assisting forces to rear tire 122 simulating downhill conditions.

This cycle is repeated at a frequency of at least 100 times per second which allow real-time simulation of cycling conditions.

User inputs 206 includes a controller which includes real time data or manufactured data and may include custom data sets and/or formulas describing any particular real or imaginary model of cycling allowing for a real-time simulation of cycling conditions.

The user inputs may for example include real road condition data which has been previously collected.

In Use

The user of bicycle trainer 100 is able to use the same bicycle 102 which they use in real life conditions.

The front wheel of bicycle 102 is removed and the front forks 108 of bicycle 102 are connected to a flexible support arm 132 which allows the bicycle to rock freely side to side along rocking arc 131 which may be as much as 45° but preferably 30° each side of centre for a total arc of 90°, or preferably 60° as a real bicycle would under real bicycling conditions.

The reader will note that the rear tire 122 mounted to the rear wheel 120 is free to move and rock side to side due to the fact that the only contact point is on the roller face 151 of roller 152.

Therefore as the user rides bicycle 102 it is free to rock side to side wherein the degree of freedom of movement is dependent upon the flexibility of flexible support arm 132.

Roller 152 is directly connected via a common shaft 154 to motor 156 which in practice may be an induction motor however alternative designs may include an out runner type of motor where the motors outer shell may serve as a roller, thereby eliminating the need for a separate motor & roller.

The combination of the roller 152, the motor 156 are free to rotate about the axis of rotation 190 due to the fact that the roller 152 and motor 156 are mounted onto bearings 160 which allow the motor to freely rotate about axis rotation 190.

It should be apparent to persons skilled in the arts that various modifications and adaptations of this structure describe above are possible without departure from the spirit of the invention the scope of which is defined in the appended claim. 

I claim:
 1. A bicycle trainer comprising: a) the front forks of a bicycle mounted to a stand; b) the stand including a flexible support arm allowing the bicycle to rock back and forth along a rocking arc; c) the rear tire of the bicycle making contact with a roller face of a roller such that the roller is free to rotate in proportion to the rotation of rear tire; d) wherein the roller is rotationally connected to a motor for selectively applying resistance and assistance to the rear tire rotation, for simulating real course conditions.
 2. The bicycle trainer claimed in claim 1 further comprising a motor assembly which includes a frame for housing the roller and motor and rigidly connecting the motor assembly to the stand, the motor is pivotally mounted to the frame about its shaft, such that the motor and roller rotate in proportional unison with each other.
 3. The bicycle trainer claimed in claim 2 wherein the motor assembly further including a force sensor for measuring the tangential force between the roller and the bicycle.
 4. The bicycle trailer claimed in claim 3, wherein the motor is rigidly mounted to a base plate which has a top side and bottom side which is free to pivot with the motor.
 5. The bicycle trainer claimed in claim 4 wherein the motor assembly includes the force sensor in contact with one side of the plate, and a spring on the other side of the plate such that the force sensor and spring restrict the rotational deflection of the base plate and thereby measure the tangential force between the roller .
 6. The bicycle trainer claimed in claim 5 where the force sensor and spring are opposing each other mounted on opposite sides of the plate, in order to maintain positive bias of force on the force sensor.
 7. The bicycle trainer claimed in claim 6 wherein the force sensor is chosen from the group comprising piezo electric, and strain gauge and load cell and magneto elastic transducers.
 8. The bicycle trainer claimed in claim 7 further including a controller which includes data sets for simulating real and imaginary road conditions.
 9. The bicycle trainer claimed in claim 8 wherein the motor assembly in response to the controllers input imparts resistance to tire rotation thereby simulating uphill or head wind conditions.
 10. The bicycle trainer claimed in claim 9 wherein the motor assembly in response to the controllers input imparts assistance to tire rotation thereby simulating downhill or downwind conditions.
 11. The bicycle trainer claimed in claim 1 wherein the flexible support arm selected to allow a rocking arc of 45° each side of centre for a total arc of 90°.
 12. The bicycle trainer claimed in claim 1 wherein the flexible support arm selected to allow a rocking arc of 30° each side of centre for a total arc of 60°. 